| Año | Valor |
|---|---|
| 1970-01-01 | 1299999.952316 |
| 1972-01-01 | 19999.999553 |
| 1973-01-01 | 419999.986887 |
| 1974-01-01 | 469999.998808 |
| 1975-01-01 | 2269999.980927 |
| 1976-01-01 | 1230000.019073 |
| 1977-01-01 | 4670000.076294 |
| 1978-01-01 | 1809999.942780 |
| 1979-01-01 | 200000.002980 |
| 1980-01-01 | 3109999.895096 |
| 1981-01-01 | 430000.007153 |
| 1982-01-01 | 1789999.961853 |
| 1983-01-01 | 2500000.000000 |
| 1984-01-01 | 1100000.023842 |
| 1985-01-01 | 4789999.961853 |
| 1986-01-01 | 829999.983311 |
| 1987-01-01 | 2339999.914169 |
| 1988-01-01 | 2299999.952316 |
| 1989-01-01 | 1409999.966621 |
| 1990-01-01 | 959999.978542 |
Fuente: World Bank